Pen



FIG. 1 is a front view of a pen showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left-side view thereof;

FIG. 4 is a right-side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof; and,

FIG. 8 is a second perspective view thereof, with the writing tip shown in an extended position. 

The ornamental design for a pen, as shown and described. 